Ubuntu :: Make A Program Output To Serial?
Nov 29, 2010
I've made a LED gadget, which can light up LED patterns. It connects to serial port with RS232 protocol and receives messages which contain desired patterns. My friend wrote a python program which generates patterns and writes them to terminal. Everything is fine this far. I've made a bash script to run this program:
#!/bin/bash
python gen.py
and set it to autostart with:
chmod 755 scr.sh
mv scr.sh /etc/init.d/scr.sh
sudo update-rc.d scr.sh defaults
What I don't understand is - how do I redirect it's output to ttyS0 so that my device could catch generated data?
I've heard that in Linux every data stream can be redirected anywhere with '>>' in bash script. How do I do that? Can I, dunno, write something like this: python gen.py >> ttyS0 in shell script?
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Jan 13, 2010
I am trying to get two way serial communications going between a Windows XP system and a Linux system (RHEL 5).I have /sbin/agetty -L 9600 ttyS0
in /etc/inittab. I am using a generic USB to serial adaptor on Windows (Unitek) and a null modem cable. I have putty configured for 9600 baud, 8 bits, no parity, one stop bit, no flow control.I get the login prompt from agetty in the putty window but input does not work; I see weird characters in the putty screen. I can echo output into the device from windows and see it, but
cat < /dev/ttyS0. just prints out weird characters from what I type.
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May 28, 2011
Is there a way to get console output over a serial (COM) port? I have a box that I use as a NAS, DNS, DHCP and mt-daapd server, I don't have a spare monitor and it is not worth buying one just to use it once or twice a year.
I found this guide [url] but it doesn't work with Natty
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Oct 4, 2010
I need to read some data from a web server and output to a serial port on the local machine. I was attempting to use the following command:
Code:
But the device attached to the serial port (a plate embosser) acts as though there is an extra newline after each line of data.
It parses the data sent according to it's own format, which includes a format string in <> followed by a data block containing one data field per line, with the whole block surrounded by <>,
For example:
Code:
seems to output as though it were:
Code:
I can verify that the web server is outputting the former (and it looks correct if I send the wget output to console).
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Jan 14, 2011
i was using a serial console program (not minicom) two weeks back but took a break and have no idea what it is! man, it was awesome, too. it had a nice gui, similar to hyperterminal...and from what i think i remember it came packaged with f14.
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Apr 29, 2010
i need to get the hard disk serial number of my machine using a C++ program.
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Jan 8, 2009
I bought a set of 3 laser sensors and it came with a software and its C++ source code for windows to receive the lasers info through the serial port. Since the entire project is running on Linux, I need to port the windows code to Linux. At the present moment, I already can receive the data from each of the 3 sensors, but the info is coming concatenated! Tracking down the original windows code, I found that it is probably happening cause I didn't ported these lines to my Linux version:
Code:
COMMTIMEOUTS CommTimeouts;
[...]
CommTimeouts.ReadIntervalTimeout = 2;
[code]....
I've searched already about how to specify the serial port timeouts on Linux, but didn't find a solution. how to port these lines to Linux or maybe where to find more info about how to set serial port timeouts on Linux?
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Apr 11, 2009
I have connected a device to my linux system with a serial cable (rs232). The settings are: port /dev/ttyS0, baud rate=38400, data bits=8, stop bits=1, no parity, no hardware or software handshaking. I wrote a linux program that sends 1 byte to the device, but the device doesn't receive it. I know the serial ports are working because when I use the CuteCOM application to send data, the device DOES receive it, so obviously it is a problem with my code..
Code:
#include <stdio.h>
#include <stdlib.h>
#include <math.h>
[code].....
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Dec 13, 2009
I wrote a serial port communication program to access a equipment.
int main(void)
{
int fd = 0;
int nread = 0,i = 0,nwrite = 0, tmpread = 0, m = 0, n = 0 ;
[code]....
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May 7, 2010
I am new to linux and am trying out script writing. I am using shell. How can I make a script to open a program then operate within that program?
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Jul 28, 2010
I want to simulate a serial protocol in user space program to test reception algorithm. The protocol is similar to UART protocol but frame format is different. The duration of 1 bit is 114,46 us. In my main function I'm creating two threads. Tx for simulating transmitting data and Rx for reception data. For measure time I use create_timer() function and signals. Each thread has its own timer and signal handler. Tx timer uses SIGUSR1 and Rx timer uses SIGUSR2. Tx thread sets the global variable and Rx reads it.
The timers are set to sample with 114,46 us period. When they reach this value signal handler should set the flag. Flag is check in thread and some operation are made. When I set the timers period for longer time (100 ms) everything works fine but when I change it to default value (114,46 us) the Rx thread doesn't receive the proper data. I am wondering if the 114,46 timer period is possible to simulate in user space? Whether the time will give me the proper resolution ? Theoretically it should provide 1 ns resolution.
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Jan 8, 2011
Is there any way to select which output device a program uses? I notice many Ubuntu programs lack the choice to choose where the sound is outputted, for example Rhythmbox and Exaile.I have 3 sound outputs (Internal, PCI, HDMI) connected and I'd like to for example use the PCI card as default audio device but play music from Rhythmbox through the internal motherboard output.
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Jun 8, 2009
See the first program below :
Code:
This code when compiled gives the following errors:
1. conflicting types for 'fun' at line no: 9
2. previous declaration of 'fun' was here at line no: 3
Why is this happening?
If i modify the above program as shown in the second program below:
Code:
This code when compiled gives no errors.
Why the difference occurs between the first and second program?
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Jun 21, 2011
I have a bit of a dilemma. I'm attempting to use a microcontroller to send MIDI messages over a virtual serial port. I want to (eventually) read them with Mixxx. I'm using an FTDI chip, so I get a /dev/ttyUSB0. I've tried spikenzielabs' Serial-Midi program, but it doesn't see any serial ports. NOTEMIDI looks really old and won't compile on my 10.04 LTS machine.
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May 22, 2010
I've got a C program that I've added some 'printf' statements to monitor a couple of variables. When I run this program manually or from a script, the output is displayed on screen. However, I need to change various variables in the 'test.c' file, run 'make clean' and 'make' a few hundred thousand times. I'm using a script to read the variables in and then using sed to do in-place edits of the file. Unfortunately, with this amount of iteration, it is getting rather tired!
Anyway, I've created a script that is working as long I respond to prompts. I've tried the following to no avail: Code: /path/to/script > /tmp/output /path/to/script > /tmp/output 2>&1 /path/to/script | tee (no output even after adding the -a option) In my C program, I have the following 'printf' statement: Code: printf ("variable1: $s variable2: $s",var1,var2); What am I missing? I've worked with redirection before and it's always worked out fine, but this one plain stumps!
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Feb 21, 2009
On my CentOS 5.2 install I've installed a dual-port serial card based on the NetMOS 9835 chipset. I've followed the serial instructions, but everything they tell me to do is already done - see setserial outputs below. I've compared these values to the lspci output (below, NetMos card is at the bottom of the output) for the card and it appears right. Problem being, I can't use the serial ports. Oh and I did use search, and looked at every 9835-related article before posting this :)
[Code]....
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Sep 8, 2010
while doing socket/network programming, i am getting SSH-2.0-openssh4.7 error, instead of showing day time of server.general description i have Linux Box, with the help of putty i am connecting from windows system to Linux box,no problem in loging,after typing program, i am running the program with gcc. when typing ./a.out, it is showing SSH-2.0-openssh4.7, actually it should display daytime from linux box in both tcp and udp.
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Apr 29, 2011
i use touch screen monitor .when some one touch on screen i want to wake up in my c program and i use this touch usb output for my prograam
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Oct 9, 2015
I am hoping to be able to get an old serial-touchscreen to work with a usb/serial adapter. I had this touchscreen working some years ago on different hardware. I would like to hook it to the machine I am setting up as a multimedia host with mythtv among other things.
Following the instructions I left behind when I got this to work way back when does not work. See [URL] ....
This info is a work around to get the xserver to see the touchscreen. [URL] ....
I do know that the touchscreen works as I am able to get garbage on the screen as in the first part of my howto. But I have not had any success getting xorg to see it. I wish I had posted a copy of the xorg.conf at the time, but......
There is an issue with the current xserver in testing that I am hoping the next update (in unstable) will fix when it gets pushed to testing. That is that Code: Select all# X -configure fails with a segfault. So I am not able to generate the xorg.conf needed to get it to work. I was going to post a bugreport, that is when I found out there is an update in unstable, so I am waiting for it to get pushed at the moment.
Anyway I am hoping that I can link /dev/ttyUSB0 to /dev/tty0 and get it to work. I would like some kind of guess as to my chances of success before I go to all the work of getting the monitor hooked to the host.
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Jun 1, 2011
I'm looking for a program that will visualize anything that goes through my audio-output (in this case it's Spotify) and display it on the screen. Does this exist?
I'm running Ubuntu.
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Feb 6, 2011
so i wrote myself a very simple hellworld program in c++
...the usual stuff
int main()
{
[code]...
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Jul 20, 2010
I have a multithreaded program running. The threads are created by using pthread_create(). The ps shows a pid value for each thread in the process. The name of the thread is all the same as the parent process. I want to match the PID values in the ps output to the threads in my program. But when I used getpid() in each thread, the value I get is different from what ps shows. How do I match the pid value in ps output to the threads in my program.
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Aug 14, 2010
I am creating a 15 integer array which is input from the user and outputted for the.
Ex.
Enter the array values: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
Your values are: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
Code:
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Mar 18, 2011
I am learning Linux daemon programming and write a simple daemon program. The issue is no data is written to the log file (/var/tmp/simpledeamon.log) though the file is successfully created (it's file size is zero from ls -l output). Could someone kindly point out the error in my program,The code is based on the Devin Watson's article at Here is the code:
// simplydaemon.cpp
// A simple Linux daemon.
#include <sys/types.h>
[code]...
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Mar 23, 2010
We have a new machine with RedHat enterprise 5 on it. I need to connect a serial cable to the serial port and talk to another system (old alpha system) instead of using a VT connected to the alpha.Does RedHat come with anything like Keaterm/hyperterm/etc etc?
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Nov 27, 2010
Can someone recommend a good app to monitor the OUTPUT of my soundcard? I don't just want to look at the VU meter of my music player - i actually want to see what the soundcard is outputting. Windows drivers for my soundcard (Audiophile 192) had this ability, but I'm not sure what software to use in Linux.
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Feb 15, 2011
I would like my ubuntu not to start/boot anything in parallel. It will start longer, but that doesn't matter. Anyone knows how to do it?
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Jun 29, 2011
I'm using Ubuntu and I'm programing with eclipse CDT. My goal is to execute a php file and read the output to my c++ program. To do so I thought I should use fork(), dup2() and execl. When in shell, the call "php myscript.php" worked just fine, but when in c++ I tried:
execl("usr/bin/php", "php", "home/geiger/workspace/SemiServer/server_content/myscript.php", NULL);
And it didn't work (the process wasn't terminated and I got no output). I tried different version of this call, like losing the "php" string and/or drop "home/geiger" from the path string, to no better result.
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Sep 15, 2010
The below program is giving unpredictable and wrong output when I compile with g++ under Ubuntu OS , tried with the complier avilable with Ubuntu 8.04 and Ubuntu 10.04 LTS.
But it works fine when complied and ran Redhat g++ 3.4.6
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Sep 12, 2010
I started a new x session on tty8. This is display 1. The first session is tty7 display 0.
I can switch between them easily enough. CTRL ALT F7 goes to tty7. CTRL ALT F8 goes to tty8.
But if I try to run, say, the "import" command for screenshots on tty8, while switched to tty7, all it gives is a black screen.
The reason being, I think, because only one session is actually outputting at any given time. How do I make both of them output, so I can take a screenshot on 1 session, but use the other session to do other stuff?
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